At <a href="http://www.freebsd.org/projects/projects.html">http://www.freebsd.org/projects/projects.html</a> you'll see it says:

Small and embedded FreeBSD (PicoBSD) PicoBSD is a one floppy version of FreeBSD which in its different variations allows you to have secure dial-up access, small diskless router, or even a dial-in server. All of this on only one standard 1.44MB floppy disk. It runs on a minimum 386SX CPU with 8MB of RAM, and no hard drive is required!

The home page is <a href="http://www.FreeBSD.org/~picobsd/">http://www.FreeBSD.org/~picobsd/</a>